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3.0T高场磁共振成像在肩袖损伤中的诊断价值

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中国医疗器械信息 2024年第2期30卷 119-121页

作者：缪仙花施建伟陈芳宁德市闽东医院医学影像科福建宁德355000

目的:探究3.0T高场磁共振成像(MRI)对肩袖损伤的诊断准确率、敏感性及特异性,分析肩袖损伤MRI肩部软组织影像,为肩袖损伤的诊断和评估提供可靠影像学依据。方法:选取2020年3月~2022年3月宁德市闽东医院医学影像科接诊的60例疑似肩袖损... 详细信息

目的:探究3.0T高场磁共振成像(MRI)对肩袖损伤的诊断准确率、敏感性及特异性,分析肩袖损伤MRI肩部软组织影像,为肩袖损伤的诊断和评估提供可靠影像学依据。方法:选取2020年3月~2022年3月宁德市闽东医院医学影像科接诊的60例疑似肩袖损伤患者作为研究对象,采用3.0T高场磁共振成像诊断,以病理检查结果为金标准,分析MRI诊断肩袖损伤的检测准确率、敏感度及特异度、MRI影像下肩关节损伤分型的一致性行Kappa检验。分析MRI影像下肩袖损伤影像特征,综合分析肩袖损伤的类型、部位和程度。结果:MRI检查准确度为93.33%(56/60)、灵敏度为94.34%(50/53),与金标准一致性很好,Kappa值=0.835、0.830,特异度为85.71%(6/7),与金标准检测特异度一致性较好,Kappa值=0.785;3.0T高场磁共振成像诊断肩袖损伤类型中,其诊断Ⅰ型、Ⅱ型与病理诊断一致性很好,诊断Ⅲ~Ⅴ型与病理诊断一致性较好。肩袖损伤MRI影像分析结果得知,T1加权成像显示肌腱的形态和位置,T2加权成像显示肌腱的水分含量、病变情况及肌腱的撕裂情况。根据肩袖损伤MRI影像可确定肩袖损伤类型,完全撕裂:T1WI低信号强度,T2WI高信号强度,肩袖组织完全断裂,肩袖冈上肌腱部位出现贯穿整个肩袖的全层断裂。部分撕裂:T2WI高信号强度,T1WI现低信号强度,表现在冈上肌腱的同侧面,信号未贯穿全层,肩袖组织出现局部变形、局部水肿。结论:肩袖损伤采用3.0T高场磁共振成像诊断价值高,可准确对肩袖损伤进行分型,通过对肩袖损伤MRI影像周围软组织的观察和分析可以确定肩袖损伤的范围、类型及严重程度,为治疗提供更为精准的参考依据。

关键词： 3.0T高场磁共振成像肩袖损伤诊断价值

Cultural Variables and International Business

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内蒙古工业大学学报（社会科学版） 2004年第1期13卷 95-97,106页

作者： miaoxian ForeignLanguageCollegeInnerMongolianUniversityofTechnology

By analyzing a set of dynamic variables of culture, this paper reaches the conclusion that there is a link between successful global business and cultural awareness and sensitivity.

关键词：关系文化国际商业

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逐级降温工况下道基含盐砾质土盐-冻胀特性

长安大学学报（自然科学版） 2024年第1期44卷 36-46页

作者：韩进宝王利鑫张莎莎余虔寇璟媛姚妙娴王运朋民航机场规划设计研究总院有限公司北京100120 长安大学公路学院陕西西安710064

为探明多因素影响下道基含硫酸盐砾质混合料的盐-冻胀变形特性及特征温度,基于天然级配、剔除大于60 mm粒径颗粒级配及添加5%含量(质量分数)细颗粒级配3种试样,分别开展3种含水率、7种不同含盐量条件下的盐-冻胀试验及冻结温度测定试验... 详细信息

为探明多因素影响下道基含硫酸盐砾质混合料的盐-冻胀变形特性及特征温度,基于天然级配、剔除大于60 mm粒径颗粒级配及添加5%含量(质量分数)细颗粒级配3种试样,分别开展3种含水率、7种不同含盐量条件下的盐-冻胀试验及冻结温度测定试验,结合PFC3D数值模拟,探究颗粒级配、含水率、含盐量对道基含硫酸盐砾质混合料的盐-冻胀变形规律及冻结温度特性的影响,并揭示其作用机理。研究结果表明:含硫酸盐砾质混合料的冻结温度主要受土体含盐量、含水率所对应的等效硫酸钠质量分数的影响;由于受试验降温方式及试样低含水率、低含盐量的综合影响,试验中未能监测到土试样的过冷温度;道基含硫酸盐砾质混合料的宏观盐胀温度低于冻结温度,添加5%含量细粒土试样的冻结温度略低于其他2种试样,3种试样的冻结温度为-1.58℃~0℃;试验土体的盐-冻胀变形率整体随含盐量、含水率的升高而增大,仅剔除大于60 mm粒径颗粒级配的盐-冻胀变形率与天然级配整体相差不大,而添加5%含量细颗粒使土体的盐-冻胀变形率提高3%~30%,提高程度受土试样含水率和含盐量的影响较大;5%含量细颗粒填充了试样中的大孔隙,减小了孔隙体积,对道基含硫酸砾质混合料的盐-冻胀敏感作用程度显著,道基填筑工程中应严格控制填料中的细粒土含量。

关键词：道路工程道基填料试验研究砾质混合料盐-冻胀量冻结温度

An integrated machine-process-controller model to predict milling surface topography considering vibration suppression

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Advances in Manufacturing 2022年第3期10卷 443-458页

作者： miao-xian Guo Jin Liu Li-Mei Pan Chong-Jun Wu Xiao-Hui Jiang Wei-Cheng Guo College of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093People's Republic of China College of Mechanical Engineering Donghua UniversityShanghai 201620People's Republic of China

Surface topography is an important factor in evaluating the surface integrity and service performance of milling parts.The dynamic characteristics of the manufacturing system and machining process parameters significantly influence the machining precision and surface quality of the parts,and the vibration control method is applied in high-precision milling to improve the machine quality.In this study,a novel surface topography model based on the dynamic characteristics of the process system,properties of the cutting process,and active vibration control system is theoretically developed and experimentally verified.The dynamic characteristics of the process system consist of the vibration of the machine tool and piezoelectric ceramic clamping system.The dynamic path trajectory influenced by the processing parameters and workpiece-tool parameters belongs to the property of the cutting process,while different algorithms of active vibration control are considered as controller factors.The milling surface topography can be predicted by considering all these factors.A series of experiments were conducted to verify the effectiveness and accuracy of the prediction model,and the results showed a good correlation between the theoretical analysis and the actual milled surfaces.

关键词： Machine-process-controller Milling surface topography Vibration suppression Prediction model

An iterative blending integrating grinding force model considering grain size and dislocation density evolution

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Advances in Manufacturing 2023年第3期11卷 428-443页

作者： Zi-Shan Ding Yun-Hui Zhao miao-xian Guo Wei-Cheng Guo Chong-Jun Wu Steven Y.Liang School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093People's Republicof China College of Mechanical Engineering Donghua UniversityShanghai 201620People's Republic of China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlanta 30332USA

The dynamic force load in grinding process is considered as a crucial factor affecting the quality of parts,and a better understanding of the mechanism of force generation is conducive to revealing the evolution of material microstructure more precisely.In this study,an iterative blending integrating grinding force model that comprehensively considers the impact of grain size and dislocation density evolution of the material is proposed.According to the grinding kinematics,the interaction of grit-workpiece is divided into rubbing,plowing,and chip formation stages in each grinding zone.On this basis,the evolution of material microstructure in the current chip formation stage will affect the rubbing force in the next grinding arc through flow stresses,which in turn will influence the total grinding force.Therefore,the flow stress models in rubbing and chip formation stages are firstly established,and then the dislocation density prediction model is established experimentally based on the characteristics of grain size.The effects of the evolution of grain size and dislocation density on the grinding forces during the grinding process are studied by means of iterative cycles.The results indicate that the implementation of an iterative blending scheme is instrumental in obtaining a higher accurate prediction of the grinding force and a deeper insight of the influence mechanisms of materials microstructure on grinding process.

关键词： Grinding force Grain size Dislocation density Iterative loop

Bow-and-arrow sign on point-of-care ultrasound for diagnosis of pacemaker lead-induced heart perforation:A case report and literature review

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World Journal of Clinical Cases 2023年第7期11卷 1615-1625页

作者： Ni Chen Guang-xian miao Liang-Qin Peng Yun-Hang Li Juan Gu Ying He Tao Chen Xiao-Yun Fu Zhou-Xiong Xing Department of Critical Care Medicine Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina Department of Ultrasound Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina Department of Cardiology Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina Department of Pharmacy Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina

BACKGROUND Pacemaker lead-induced heart perforation is a rare but life-threatening complication of pacemaker implantation,and timely diagnosis remains a challenge for clinicians.Here,we report a case of pacemaker lead-induced cardiac perforation rapidly diagnosed by a“bow-and-arrow”sign on point-of-care ultrasound(POCUS).CASE SUMMARY A 74-year-old Chinese woman who had undergone permanent pacemaker implantation 26 d before suddenly developed severe dyspnea,chest pain,and hypotension.The patient had received emergency laparotomy for an incarcerated groin hernia and was transferred to the intensive care unit 6 d before.Computed tomography was not available due to unstable hemodynamic status,so POCUS was performed at the bedside and revealed severe pericardial effusion and cardiac tamponade.Subsequent pericardiocentesis yielded a large volume of bloody pericardial fluid.Further POCUS by an ultrasonographist revealed a unique“bow-and-arrow”sign indicating right ventricular(RV)apex perforation by the pacemaker lead,which facilitated the rapid diagnosis of lead perforation.Given the persistent drainage of pericardial bleeding,urgent off-pump open chest surgery was performed to repair the perforation.However,the patient died of shock and multiple organ dysfunction syndrome within 24 h post-surgery.In addition,we also performed a literature review on the sonographic features of RV apex perforation by lead.CONCLUSION POCUS enables the early diagnosis of pacemaker lead perforation at the bedside.A step-wise ultrasonographic approach and the“bow-and-arrow”sign on POCUS are helpful for rapid diagnosis of lead perforation.

关键词： Point-of-care ultrasound Heart perforation Pacemaker lead Cardiac pacemaker Review Case report

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氢气使用实验室防火设计探讨

工程建设与设计 2024年第3期 58-60页

作者：刘虎平崔家文李秀王学思苗献锋中核第四研究设计工程有限公司石家庄050021

结合工程实例,以某使用氢气的化学实验室防火设计作为对象,梳理了国内相关设计标准和规范,并就其条款具体适用性进行了分析说明,介绍了美国消防协会的相关规范,就规范相关要求与实验室实际设计方案进行了对比。

关键词：实验室防火设计氢气

Systemic autoimmune abnormalities complicated by cytomegalovirus-induced hemophagocytic lymphohistiocytosis:A case report

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World Journal of Clinical Cases 2020年第20期8卷 4946-4952页

作者： Shu-xian miao Zhi-Qi Wu Hua-Guo Xu Department of Laboratory Medicine The First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029Jiangsu ProvinceChina

BACKGROUND Hemophagocytic lymphohistiocytosis(HLH)is a rare but life-threatening disorder,characterized by a hyperimmune response.The mortality is high despite progress being made in the diagnosis and treatment of the disease.HLH is traditionally divided into primary(familial or genetic)and secondary(reactive)according to the etiology.Secondary HLH(sHLH),more common in adults,is often associated with underlying conditions including severe infections,malignancies,autoimmune diseases,or other etiologies.CASE SUMMARY The case involves a 31-year-old woman,presented with a high persistent fever,rash,and splenomegaly.She met the diagnostic criteria of the HLH-2004 guideline and thus was diagnosed with HLH,with positive anti-nuclear antibody(ANA)and positive cytomegalovirus(CMV)-DNA.The patient responded well to a combination of immunomodulatory,chemotherapy,and supportive treatments.When her PCR evaluation for CMV turned negative,her serum ferritin also dropped significantly.Her clinical symptoms improved dramatically,and except for ANA,the abnormal laboratory findings associated with HLH returned to normal.Our previous study has shown that the median overall survival of HLH patients is only 6 mo;however,our patient has been cured and has not presented with any relapse of the disease for 6 years.CONCLUSION This case emphasizes that thorough early removal of the CMV infection is significant for the prognosis of this HLH patient.

关键词： Hemophagocytic lymphohistiocytosis Autoimmune abnormalities Cytomegalovirus Anti-nuclear antibody Serum ferritin Case report

两种方式治疗单节段腰椎间盘突出症的疗效比较

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临床骨科杂志 2024年第2期27卷 176-180页

作者：林松陈钱陈洪柱郭明伟苗吉显朱卉敏河南省洛阳正骨医院(河南省骨科医院)脊柱外科河南郑州450000

目的比较微创经椎间孔入路腰椎椎间融合术(MIS-TLIF)单侧椎弓根固定与经椎间孔入路腰椎椎间融合(TLIF)单侧椎弓根固定治疗单节段腰椎间盘突出症的临床疗效。方法将55例单节段腰椎间盘突出症患者根据治疗方法不同分为MIS-TLIF组(29例)和T... 详细信息

目的比较微创经椎间孔入路腰椎椎间融合术(MIS-TLIF)单侧椎弓根固定与经椎间孔入路腰椎椎间融合(TLIF)单侧椎弓根固定治疗单节段腰椎间盘突出症的临床疗效。方法将55例单节段腰椎间盘突出症患者根据治疗方法不同分为MIS-TLIF组(29例)和TLIF组(26例)。记录两组手术时间、切口长度、术中出血量、术后24 h引流量、住院时间及术后并发症,采用ODI评分和JOA评分评估临床疗效。结果患者均获得随访,时间6~15个月。两组手术时间、术中出血量、住院时间比较差异均无统计学意义(P>0.05)。切口长度和术后24 h引流量TLIF组长(多)于MIS-TLIF组(P0.05)。术后6个月JOA评分改善率两组比较差异无统计学意义(P>0.05)。结论MIS-TLIF与TLIF单侧椎弓根固定治疗单节段腰椎间盘突出症均可获得满意的临床疗效,但MIS-TLIF具有切口小、术后引流量少的优点。

关键词：微创经椎间孔入路腰椎椎间融合术经椎间孔入路腰椎椎间融合术腰椎间盘突出症固定融合